Rein Tsukumo (the main protagonist) was born with four different Heavenly Restrictions. Normally, such a thing should be impossible, but fate works in mysterious ways, granting him four distinct abilities, each paired with its own unique tradeoff.
1. Enhanced Physiology
Much like Toji Fushiguro from JJK, Rein has a superhumanly gifted body. He is much stronger than a standard supernatural being physically.
Tradeoff:
No Magic Potential. He is unable to use Magic. Even if he were to be a reincarnated devil, no magic potential would mean he would not even be able to learn basic spells.
2. Temple of Time
His right eye has the power to see two hours into the future, usable once per day. The future he sees is near perfect, but not set in stone — any major changes in the present can alter it. He is given three slots: he can use each slot individually to see someone else's future, or expend all three at once to see his own. Slot usage resets daily.
Tradeoff:
His right eye is blind, and this blindness is permanent, incapable of being cured by any means.
Appearance: Due to the unique nature of this Heavenly Restriction, his right iris appears exotic, featuring a clock-themed pupil.
3. Polymorphic Immunity
Provides immunity to targeted supernatural transformations.
Tradeoff:
Even willingly, he cannot transform into another species. The only exceptions are natural evolution or ascending to godhood.
4. Essence Protection
Provides existential protection by making his soul and mind extremely resilient. It grants near immunity to all soul- and mind-based attacks.
Tradeoff:
His lifespan is permanently halved and cannot be restored by Senjutsu or any other life-extending means. For example, if he could naturally live to 100, he will now die at 50. Should he be resurrected after reaching this age, the resurrection will fail, making this cost truly irreversible.